Polycom H340 User Manual

Page 29

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Deploying SpectraLink e340, h340 and i640 Wireless Telephones

BEST PRACTICES GUIDE

October 2010

Gateway implementation the handset will also require DHCP options 151 and/or 152. Option 151 is specifically the IP

address of the Registration SVP Server. Option 152 is for deployments that are running an OAI Gateway where the

option field is populated with the IP address of the OAI Gateway. These options are only accepted as IP address by

the handset.

DHCP Option 66, as defined by RFC 2132, provides the address of a TFTP server. A TFTP server is required for any

SIP implementation and is only required in other IP protocols when software updates are needed. It is recommended

that a TFTP server be made available regardless of the implementation. In SRP deployments the Telephony

Gateway can act as a TFTP server but it is only capable of servicing a single handset at a time. Because of these

limitations an external TFTP server is advisable and is often required in order to serve multiple clients at once.

Additional DHCP options are supported on the SpectraLink Wireless Telephones and can be configured in the DHCP

scope appropriate for the IP scope servicing the handsets. See the Table 5 for the list of DHCP options typically used

and their purpose.

DHCP

Option

Value Expected

Purpose

IP Address (i.e. 255.255.255.0)

Subnet Mask

IP Address (i.e. 192.168.1.1)

Default Gateway

IP Address (i.e. 192.168.1.10)

DNS Server

IP Address (i.e. 192.168.1.20)

Syslog Server

String (i.e. mycompany.com)

Domain Name

IP Address (i.e. 192.168.1.30

NTP (Network Time Protocol)

IP Address (i.e. 192.168.1.40)

TFTP Server

151

IP Address (i.e. 192.168.1.50)

SVP Server

152

IP Address (i.e. 192.168.1.60)

OAI Gateway

Table 5 – DHCP Options

Depending on the IP protocol implementation additional DHCP options will be required to support the call server. The

options will likely include additional TFTP server addresses and the IP address of the call server. These DHCP

options should be provided by the call server manufacturer to ensure the appropriate information and values required

for those options are correct for the specific IP protocol deployment.

While the wireless telephone does support using a DNS server, as shown in Table 5, it is not recommended to do so.

Using DNS creates a dependency on a service that may not be reliable when the services a phone provides can be

critical. By using DNS there is also the addition of latency in transactions that the handset must complete with the

DNS server which could lead to undesirable behavior from the wireless telephone. Please note if DNS is necessary

then DHCP option 15 is also required. Without both DHCP options 6 and 15 the wireless telephone will not be able to

complete DNS queries

This manual is related to the following products:

I640